Complete Guide to Constructing a Bazi Chart

If you want to learn Bazi properly, the first step is to get the four pillars right. Many people think charting is just converting a birth date and time into stems and branches—but there is a lot more to it. If the chart is wrong, everything that follows—Ten Gods, strong/weak Day Master, useful gods, Luck Pillars, annual luck—will drift off course. This chapter walks through the four pillars from the ground up, step by step, whether you were born in Asia, Europe, the Americas, or elsewhere.

First, what are the “four pillars” and “eight characters”? Your birth time is split into four parts: Year, Month, Day, and Hour pillars. Each pillar has two characters—one heavenly stem and one earthly branch—eight characters in total, hence “Bazi.” Each pillar has its own meaning:

• Year pillar: roots, ancestors, and the wider environment; early-life luck is also tied to it.
• Month pillar: parents and siblings, plus career and family atmosphere in mid-life.
• Day pillar: the most important—the Day Master (the day stem) is you, and the whole chart revolves around it.
• Hour pillar: children, descendants, and later life.

Traditional charting does not use lunar New Year month or January 1 on the Gregorian calendar for the year and month pillars—it relies entirely on the 24 solar terms. That can feel unfamiliar if you are used to everyday calendars, but it is central to how Bazi aligns with “heaven’s timing.”

How to build the four pillars step by step

Gather the most accurate birth data you can—preferably Gregorian (solar) year, month, day, and time in 24-hour notation from hospital or civil records. If you only have a lunar date, convert to Gregorian first. Note sex as well, because it affects whether Luck Pillars run forward or backward.

Year pillar

The Bazi “year” does not flip on January 1 or on lunar New Year’s Day. The boundary is Lichun (Start of Spring) among the 24 solar terms.

• Born on or after Lichun → use the stems and branches of that calendar year.
• Born before Lichun → still use the previous year’s stems and branches.

This applies worldwide: use local Lichun time for the place of birth. Lichun usually falls around February 3–5; check a reliable ephemeris or calendar.

Month pillar

This step is both critical and easy to get wrong. The month pillar is divided only by solar terms: each term begins a new “lunar month” in Bazi, and the month branch is fixed—for example:

• Lichun → Awakening of Insects → first month (Yin month)
• Awakening of Insects → Clear and Bright → second month (Mao month)
• Clear and Bright → Start of Summer → third month (Chen month)
• Start of Summer → Grain in Ear → fourth month (Si month)

Continue the same pattern—for example, Hai month (Start of Winter to Major Snow), Zi month (Major Snow to Minor Cold), and Chou month (Minor Cold to the next Start of Spring) are the eleventh and twelfth months of the cycle. The month stem is derived with the “Five Tiger” (Wuhu) rule from the year stem. The month pillar strongly affects element strength and weakness—do not map it from the lunar month number printed on a generic calendar.

Day pillar

The day pillar records each day using the 60 Jiazi cycle. Most people today use a reliable algorithm or table. The day stem is “I”—the core of the whole chart.

Hour pillar

Map the birth hour to the 12 two-hour periods (shi):

• Zi: 11:00 p.m.–1:00 a.m.
• Chou: 1:00–3:00 a.m.
• Yin: 3:00–5:00 a.m.—and so on.

Zi is special: it spans midnight, so “early” vs “late” Zi and whether the day has already changed must be handled carefully.

It sounds tedious, but once you internalize solar terms, the chart becomes much clearer. The classic beginner mistake is to line the month pillar up with Gregorian or lunar calendar months—then the month pillar is wrong and the whole reading points the wrong way.

Notes for births anywhere in the world

Whether you were born in mainland China, Taiwan, Southeast Asia, Europe, the Americas, or Australia, the principles are the same. Still, watch time zones and seasonal clock differences. If your country uses daylight saving time, convert to standard time before you calculate.

Times near boundary hours (e.g. around 7:00, 11:00, 15:00, 23:00) are the riskiest—being off by a few minutes can change the hour pillar and shift how the chart reads. Use the most precise time you can, and if possible confirm hospital birth records with family.

True solar time: the last refinement

Once the four pillars look solid, you can optionally push closer to classical precision with true solar time adjustment.

The ancients used sundials to read the sun’s shadow—that is true solar time. Clock time is mean solar time for civil life. The two can differ by several minutes each day, and at pillar boundaries that gap matters.

When is adjustment worth it?

• Birth time sits right on the edge of a two-hour period.
• You want a deeper, more professional analysis.

The method is straightforward: convert clock time at birth to true solar time for that day, then recompute the chart with the adjusted time. Before and after adjustment, the chart can differ noticeably—this is part of the classical idea of aligning the chart with “heaven and human as one.”

Once the chart is set, you have the basic natal structure. Next you can study stems and branches in detail, Ten Gods in practice, or move on to judging strong/weak Day Master and useful gods. To try charting yourself with modern tools, visit Ming Ming 3 Bazi.